Wavelength-converting casting composition and its use

A light-emitting semiconductor component, comprising:

• a semiconductor body formed of a semiconductor layer sequence and being capable, during an operation of the semiconductor component, of emitting electromagnetic radiation in at least one of an ultraviolet, blue, and green spectral range;
• a wavelength-converting casting composition disposed in a vicinity of said semiconductor body, said casting composition being formed of a transparent epoxy casting resin and an inorganic luminous substance pigment powder dispersed in said transparent epoxy resin, said pigment powder comprising luminous substance pigments from a phosphorus group having the general formula A.sub.3 B.sub.5 X.sub.12 :M, where A is an element selected from the group consisting of Y, Ca, Sr;
• B is an element selected from the group consisting of Al, Ga, Si;
• X is an element selected from the group consisting of O and S;
• M is an element selected from the group consisting of Ce and Tb, and having grain sizes.ltoreq.20 .mu.m and a mean grain diameter d.sub.50 .ltoreq.5 .mu.m;
• said luminous substance pigments converting a portion of the radiation originating from the ultraviolet, blue and green spectral range into radiation of a higher wavelength, such that the semiconductor component emits mixed radiation including the higher-wavelength radiation and radiation from at least one of the ultraviolet, blue and green spectral range.